Sculpt: Preview the active side of the line gestures

This adds a small gradient to the right side of the line to preview
which side of the mesh is going to be affected by the gesture operation.

Reviewed By: Severin

Differential Revision: https://developer.blender.org/D9106

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/windowmanager/intern/wm_gesture_ops.c b/source/blender/windowmanager/intern/wm_gesture_ops.c
index 591f95926d4..2c79b1f2215 100644
--- a/source/blender/windowmanager/intern/wm_gesture_ops.c
+++ b/source/blender/windowmanager/intern/wm_gesture_ops.c
@@ -849,6 +849,17 @@ int WM_gesture_straightline_invoke(bContext *C, wmOperator *op, const wmEvent *e
 
   return OPERATOR_RUNNING_MODAL;
 }
+/**
+ * This invoke callback starts the straightline gesture with a viewport preview to the right side
+ * of the line.
+ */
+int WM_gesture_straightline_active_side_invoke(bContext *C, wmOperator *op, const wmEvent *event)
+{
+  WM_gesture_straightline_invoke(C, op, event);
+  wmGesture *gesture = op->customdata;
+  gesture->draw_active_side = true;
+  return OPERATOR_RUNNING_MODAL;
+}
 
 /**
  * This modal callback calls exec once per mouse move event while the gesture is active with the